Tension-release



(No Model.)

J. 8v W. L. HEBERLING.

E TENSION RELEASE. NG' 287'928' Patented Nov. 6,1883.

f `JOHN,HEBERLING AND lWILLIAM fi UNITED STATES PATENT EEicE- i L.HEBERLING, OF MOUNT PLEASANT, OHIO.

TENSION-RELEASE.

SPECIFICATIGN forming part of Letters Patent No. 287,928, dated November6, 1883.

Application filed July 19, 1883i (No model.)

To @ZZ whom it' may concern..-

Be it known that We, JOHN HEBERLTNG and W'ILLIAM L. HEEERLING, citizensof the vUnited States, residing at Mount Pleasant, in the county ofJefferson and State of Ohio, have invented certain new andusefulImprovements in Tension-Releases; and We do declare the ,following to bea full, clear, and exact description of the invention, such as willenable others skilled in the 'art to which it appertains to make and usethe saine, referencebeinghad to the accompanying drawings, and to theletters and gures of reference marked thereon, which form a part of thisspecification.

'Our invention relates Y to improvements in devices for releasing thetension from the upper thread of sewing-machines; and it consists in thedevices hereinafter fully described, and specifically pointed out in theclaims. f

AIn the draivings, Figure l is a perspective view, illustrating ourinvention applied to a sewing-maohine head. Fig. 2 is a verticaldetached section of the head and our tension mechanism. Fig. 3 is asectional view similar to Fig. 2, except the tension in Fig. 2 is onthethread, While in Fig. 3 it is released. Fig. 4

is a detail viewof the piston; and Figs. 5, 6, and 7 are detail views.

The object of our invention is to provide a convenient, simple, andeasily-operated device for releasing the tension on the upper thread ofthe machine, so the Work may be removed from under the needle readily,and without breaking the thread or injuring the`needle.

Our tension-release is composed of the stud A, secured to thesewing-machine head, the coil-spring B, placed thereon, the disks (l C,

the piston D, and the thumb-nut Il, all ofA which will be described.

' In applying our invention to a machine We drill a mortise, f, in the.front of the machinehead F, next the operator, and from the base ofthis mortise We form the threaded extension f', of, smaller diameterthan the said, mortise.

4The stud A is threaded at both ends and turned into this extension f',as shown. The outer end of this stud is formed with the longitudinalslot fr, open at its outer end, as shown. This slot is madeof a lengthto extend beyond the position of the tension-disks when thelatter are inplace on the stud. The piston D is made of a size to slide in the slota, and it is provided on one end with the ring d, iitted to move on thestud A, and on its opposite end is screwed or riveted the thumb-piece orbutton d. This piston is placed ring end foremost in the stud A. Thedisks C C are then slipped over the piston and stud, followed by 'thethumb-nut E,Whioh turns on the stud, and

ently described, Where the ring d is removableA` and the thumb-piece dis permanently riveted in place, the operation as above is changedto theextent that the disks and nut E are placed on the piston before it isplaced in the slot of the stud.

The spring B bears between the base of the mort-ise f and the ring d,and its outward press, ure is thence applied to the disks, forcing themclosely together. By means of the thumbnut E the degree of tension may-be readily regulated to suit the different-sized threads or the Wishesofthe operator.

When the several parts are in the position shown in Fig. 2, the tensionis on the thread. In Fig. 3 the piston, by pressure on button d, hasbeen forced in, the ring d pushing the spring' B back, and the tensionis released, and the threadmay be readily drawn through the disks.

In constructing our piston, inner ring, 85e., We prefer to stamp theWhole out of sheet metal, in shape as shown in Figs. 6 and 7 so thatthethumb-.piece d may be riveted permanently on the outer end of the pistonD, While the ring d and the inner end of the pistonD are so shaped thatthey may be attached or detached at will. This may be done by notchingthe edges of the piston D near its inner end, as shown at ca in Fig. 5,and forming the ring d with proj ections c e on its inner side, to fitinto the notches a a', so that if the inner end of thepistonDbe insertedin the ring d while it is yet off the stud A and turned round in it theproj ections e e on the inside of the ring will pass into the notches aa in the piston, and if while there the piston and ring are passed totheir respective positions in and on the stud A they will be held intactby it, so as to retain their proper relative posit-ions with each other,as shown in Fig. 6.

It is apparent that when these parts are made as just described thethumb-nut E and disks C C are all placed on the piston D from its innerend, while it is yet out of the slotted stud A, and before the ring dhas been fixed upon it, and the disks, nut, 81o., maybe readilyseparated from the piston, when the latter is removed from the stud,without the removal ofthe thumbbutton,which,being permanently riveted tothe piston, cannot become unscrewed and lost, as in case of the threadedbutton before described, and shown in Fig. 4l.

It will be seen that our device is simple,and is not liable to get outof order, and that it can be profitably applied to agreat variety of sewing-machines, regardless of the internal mechanism of their heads.

Having thus described our invention, what we claim, and desire to secureby Letters Patent, is

1. In a tension-release, the combination,

substantially as described and shown, of the sewing-machine head havingthe mortise fformed in its front edge, and the threaded socket fextended therefrom, the stud A, made smaller than mortise f, and havingits inner end screwed into the extension j', and its outer end providedwith the slot a, the spring B, secured in the niortise f on the stud A,the piston D, placed in the slot a and having the ring d secured on itsinner end and bearing against the spring B, thetension-disks C C, placedon the stud againstthe ring d, and the retaining and adjusting nut E,screwed on the outer end of the stud against the disks C C, all arrangedand operating as and for the purposes specied. 2. The tension-release,substantially as described and shown, composed of the supporting-studhaving a slot, a, formed in its` outer` end, theftensionspring, thedisks, the retaining-nut,the piston iitted to the slot inthe stud,

and placed and movable therein, and having notches a a formed in itsinner end, and the ring d,having projections orlugse e extended inwardtherefrom into the notches a a of the piston, all arranged and adaptedto operate substantially as set forth.

In testimony whereof We afX our signatures in presence of two witnesses.

JOHN HEBERLING.

WILLIAM L. HEBERLING.

Witnesses:

R. T.l UPDEGRAFF,

E. B. JONES.

